Flora of North America species comparison

usually straight, spreading, young growth white-puberulous to tomentose, resting buds absent.

alternate, even-bipinnate, not sensitive to touch;

stipules present, early caducous, not spinescent;

petiole, rachis, and pinnae often with extrafloral nectaries;

petiolate;

pinnae (1 or)2–12 pairs, opposite;

leaflets 10–44(–72), opposite, usually asymmetric, terminal pair usually heteromorphic, blade margins entire, surfaces pubescent.

15–40-flowered, axillary or terminal, capitula or capitulalike corymbs, arranged in panicles;

bracts present, deltate, densely strigillose.

mimosoid, when dimorphic, central flowers sessile, larger than peripheral, 5 or 7 or 8-merous;

peripheral flowers usually pedicellate, 5-merous;

calyx campanulate or tubular, lobes 5 or 6, calyx and corolla connate, valvate;

corolla whitish or pink to yellow-green;

stamens 20–70, filaments sometimes connate, usually long-exserted;

anthers dorsifixed, eglandular.

legumes, stipitate or sessile, usually straight, flat, oblong, margins slightly thickened, sometimes winged, dehiscent or late dehiscent, glabrous or pubescent;

not fleshy or pulpy, not septate between seeds.

4–12[–20], globose, obovoid, or wide elliptic; strongly biconvex, with open pleurogram, aril and endosperm absent.

= 13.